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authorAndreas Jaeger <aj@suse.de>2000-05-31 12:21:21 +0000
committerAndreas Jaeger <aj@suse.de>2000-05-31 12:21:21 +0000
commita3a99e0165c81c96c62340df70ea03bf6411842b (patch)
treef1887e0585fb54c3d30fee73b610f672a0a69e72
parentc3e485f12a79c823946edb6b31fc54190b959cdf (diff)
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* sysdeps/mips/pspinlock.c: Implement spinlocks.
2000-05-31 Andreas Jaeger <aj@suse.de> * sysdeps/mips/pspinlock.c: Implement spinlocks.
-rw-r--r--linuxthreads/ChangeLog4
-rw-r--r--linuxthreads/sysdeps/mips/pspinlock.c34
2 files changed, 34 insertions, 4 deletions
diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 25b91e5ea2..00080c8622 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,7 @@
+2000-05-31 Andreas Jaeger <aj@suse.de>
+
+ * sysdeps/mips/pspinlock.c: Implement spinlocks.
+
2000-05-28 Ulrich Drepper <drepper@redhat.com>
* spinlock.c (__pthread_lock): Remove ASSERT.
diff --git a/linuxthreads/sysdeps/mips/pspinlock.c b/linuxthreads/sysdeps/mips/pspinlock.c
index d6cda216ff..906fb4ae60 100644
--- a/linuxthreads/sysdeps/mips/pspinlock.c
+++ b/linuxthreads/sysdeps/mips/pspinlock.c
@@ -21,10 +21,28 @@
#include <pthread.h>
+/* This implementation is similar to the one used in the Linux kernel. */
int
__pthread_spin_lock (pthread_spinlock_t *lock)
{
- XXX
+ unsigned int tmp;
+
+ asm volatile
+ (".set\tnoreorder\t\t\t# spin_lock\n"
+ ".set\tpush\n"
+ ".set\tmips2\n"
+ "1:\tll\t%1, %2\n\t"
+ "bnez\t%1, 1b\n\t"
+ " li\t%1, 1\n\t"
+ "sc\t%1, %0\n\t"
+ "beqz\t%1, 1b\n\t"
+ ".set\tpop\n"
+ ".set\treorder"
+ : "=o" (*lock), "=&r" (tmp)
+ : "o" (*lock)
+ : "memory");
+
+ return 0;
}
weak_alias (__pthread_spin_lock, pthread_spin_lock)
@@ -32,7 +50,8 @@ weak_alias (__pthread_spin_lock, pthread_spin_lock)
int
__pthread_spin_trylock (pthread_spinlock_t *lock)
{
- XXX
+ /* To be done. */
+ return 0;
}
weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
@@ -40,7 +59,14 @@ weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
int
__pthread_spin_unlock (pthread_spinlock_t *lock)
{
- XXX
+ asm volatile
+ (".set\tnoreorder\t\t\t# spin_unlock\n\t"
+ "sw\t$0, %0\n\t"
+ ".set\treorder"
+ : "=o" (*lock)
+ : "o" (*lock)
+ : "memory");
+ return 0;
}
weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
@@ -51,7 +77,7 @@ __pthread_spin_init (pthread_spinlock_t *lock, int pshared)
/* We can ignore the `pshared' parameter. Since we are busy-waiting
all processes which can access the memory location `lock' points
to can use the spinlock. */
- XXX
+ *lock = 1;
return 0;
}
weak_alias (__pthread_spin_init, pthread_spin_init)